(19)
(11) EP 1 772 863 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
24.12.2008 Bulletin 2008/52

(43) Date of publication A2:
11.04.2007 Bulletin 2007/15

(21) Application number: 07000034.4

(22) Date of filing: 05.04.2000
(51) International Patent Classification (IPC): 
G11B 7/26(2006.01)
 G11B 7/007(2006.01)
(84) Designated Contracting States:
DE FR GB

(30) Priority: 08.04.1999 JP 10146699

(62) Application number of the earlier application in accordance with Art. 76 EPC:
00107085.3 / 1043714

(71) Applicant: Pioneer Corporation
Tokyo 153-8654 (JP)

(72) Inventors:
  • Takishita, Toshihiko ,c/o Pioneer Video Corp.
    Nakakoma-gun Yamanashi (JP)
  • Kato, Masahiro ,c/o Pioneer Tokorozawa Plant
    Tokorozawa-city Saitama (JP)
  • Muramatsu, Eiji ,c/o Pioneer Tokorozawa Plant
    Tokorozawa-city Saitama (JP)
  • Horikawa, Kunihiko ,Pioneer Tokorozawa Plant
    Tokorozawa-city Saitama (JP)
  • Taniguchi, Shoji ,c/o Pioneer Tokorozawa Plant
    Tokorozawa-city Saitama (JP)
  • Yamaguchi, Atsushi ,c/o Pioneer Tokorozama Plant
    Tokorozawa-city Saitama (JP)

(74) Representative: Klingseisen, Franz 
Klingseisen & Partner Postfach 10 15 61
80089 München
80089 München (DE)

   


(54) Optical recording medium


(57) A method for manufacturing an optical recording medium having a groove track on which pits carrying data are to be formed, and a land pre-pit track connected to said groove track, wherein a plurality of land prepits are previously formed on said land pre-pit track, is disclosed in which land pre-pits are formed by
a step for shifting a spot of a cutting light beam projected onto a mask sheet in a direction perpendicular to a direction in which said groove information track extends; and a step for returning said spot after being shifted, wherein said groove information track is thereby made to have a smaller track width in at least a part of each of sections in which said land prepit exists, than in sections in which no land prepit exists.







Search report